Cover plate assembly and battery

Abstract

The utility model discloses a cover plate assembly. The cover plate assembly comprises a stop frame and a pole connecting piece, the stop frame comprises a main body part and a stop bulge arranged on the first surface of the main body part; the pole connecting piece is fixedly overlapped in the central area of the first surface of the main body part; the second surface, deviating from the stop frame, of the pole connecting piece is provided with a connecting piece covering area; the stop bulge is arranged on the periphery of the pole connecting piece; the limiting gap is arranged between the stop bulges, is configured to be a deviation rectifying piece for accommodating the electrode connecting piece, and is arranged from the outer edge of the first surface to the pole connecting piece in a penetrating manner; and the groups of limiting notches are respectively arranged on two opposite sides of the first direction of the coverage area of the connecting sheet. According to the cover plate assembly, the position of the electrode connecting piece is corrected by stretching the correcting piece into the limiting notch, so that the welding position of the pole connecting piece and the electrode connecting piece is accurate. The utility model also discloses a battery comprising the cover plate assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a cover plate assembly and a battery. Background Art

[0002] The tabs are connected to the poles of the cover assembly through the electrode connecting sheet. The production of the battery includes the following cover assembly steps: the main body of the winding core is placed in the shell to obtain the winding core shell assembly, the winding core shell assembly is introduced into the welding station through the transfer mechanism, the winding core tab extending out of the shell port is laser welded to the cover through the electrode connecting piece, the tabs and / or the electrode connecting sheet are bent, and the tabs are bent and the cover and the shell are closed at the same time.

[0003] The defects in actual production are: the fast transmission speed of the transfer mechanism causes the pole ear to deform, causing the electrode connecting piece to deviate from the predetermined welding position. After bending, the negative pole ear is twisted and difficult to enter the shell, and the high automation assembly rate is low. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects in the prior art and provide a cover assembly, which corrects the position of the electrode connecting piece by setting a limiting notch for accommodating the correcting piece, so as to make the welding position of the pole connecting piece and the electrode connecting piece accurate.

[0005] In order to achieve the above technical effects, the technical solution of the utility model is: a cover assembly, comprising:

[0006] The stop frame comprises a main body and a stop protrusion disposed on a first surface of the main body;

[0007] A pole connector, fixedly overlapped on the central area of ​​the first surface of the main body, and having a connection sheet covering area on the second surface facing away from the stop frame;

[0008] The stop protrusion is arranged on the outer periphery of the pole connector; and further comprises:

[0009] A limiting notch is provided between the stop protrusions, configured to accommodate a deviation-correcting member of the electrode connecting piece, and is provided from the outer edge of the first surface to the pole connecting member;

[0010] The group of limiting notches are arranged at two opposite sides of the first direction of the area covered by the connecting piece.

[0011] A preferred technical solution is that an avoidance recess is provided at the edge of the pole connector, and the avoidance recess is provided to be connected to the limiting notch in correspondence.

[0012] A preferred technical solution is that the pole connector is provided with a first connecting portion, the first connecting portion is connected to the pole, and the limiting notches are symmetrically arranged on two opposite sides of the first connecting portion in a first direction.

[0013] A preferred technical solution is that a limiting protrusion is provided on the first surface of the main body, the limiting protrusion is spaced apart from the pole connector, the limiting protrusion is provided on the side of the second direction of the connecting piece covering area, the first direction intersects with the second direction; the limiting protrusion has a connecting piece abutting surface.

[0014] A preferred technical solution is that a cover plate body is arranged on the side of the stop frame away from the pole connector, and the cover plate body is connected to the pole connector through the pole.

[0015] A preferred technical solution is that the outer edge of the pole connector is provided with a first notch for accommodating the bent portion of the electrode connecting piece;

[0016] The limiting notch and the first notch are respectively arranged on two opposite side edges of the pole connector.

[0017] A preferred technical solution is that the first direction spacing between the two avoidance recesses is equal to or smaller than the first direction dimension of the covering area of ​​the connecting piece.

[0018] A preferred technical solution is that the limiting protrusion is arranged between the two limiting notches.

[0019] The second object of the present utility model is to provide a battery, comprising the above-mentioned cover plate assembly, and also comprising a winding core and a shell, wherein the pole lug of the winding core is connected to the pole connector through an electrode connecting sheet.

[0020] A preferred technical solution is that the electrode connecting piece is a magnetic connecting piece.

[0021] The advantages and beneficial effects of the utility model are:

[0022] The cover assembly is provided with limiting notches opposite to each other along a first direction, and the correcting member of the electrode connecting piece extends into the limiting notch and abuts against the opposite side of the electrode connecting piece to correct the position of the electrode connecting piece so that the welding position of the electrode connecting piece and the pole connecting piece is accurate, thereby improving the accuracy of the punching position of the pole ear and / or the electrode connecting piece, reducing the probability of the pole ear being twisted and difficult to enter the shell due to the deflection of the electrode connecting piece, and improving the quality rate of the battery automated assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the front structural view of a cover plate assembly according to an embodiment;

[0024] Figure 2is a schematic diagram of the front view of the cover assembly of another embodiment;

[0025] Figure 3 yes Figure 2 Front view of the assembly structure of the middle cover assembly and the negative electrode connecting piece (before the negative electrode connecting piece is corrected);

[0026] Figure 4 yes Figure 2 Front view of the assembly structure of the middle cover assembly and the negative electrode connecting piece (after the negative electrode connecting piece is corrected);

[0027] Figure 5 A schematic diagram of a battery structure including a cover plate assembly;

[0028] Figure 6 is a schematic diagram of the front view of the cover assembly of another second embodiment;

[0029] Figure 7 It is a front view of the assembly structure of the cover plate assembly and the negative electrode connecting piece of another third embodiment (the deviation-correcting piece is not in contact with the negative electrode connecting piece);

[0030] In the figure: 1. stop frame; 101. main body; 102. stop protrusion; 103. limit notch; 104. limit protrusion; 2. pole connector; 201. avoidance notch; 202. first connecting part; 203. first notch; 3. cover body; 4. negative electrode connecting piece; 401. first area; 402. second area; 5. winding core; 6. shell;

[0031] a. Connecting piece covering area; b. Connecting piece abutting surface. DETAILED DESCRIPTION

[0032] The following examples are used to further describe the specific implementation of the present invention. The following examples are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0033] In the description of the present application, it should be noted that, unless otherwise specified, “plurality” means more than two; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] In the description of the present invention, "first", "second" and the like are used to distinguish different objects rather than to describe a specific order or a primary-secondary relationship.

[0036] Example

[0037] like Figure 1-7 As shown, the cover assembly of the embodiment includes a stop frame 1 and a pole connector 2; the stop frame 1 includes a main body 101 and a stop protrusion 102 arranged on the first surface of the main body 101; the pole connector 2 is fixedly stacked on the central area of ​​the first surface of the main body 101, and the second surface of the pole connector 2 facing away from the stop frame 1 has a connecting piece covering area a ( Figure 2 , 6 The stop protrusion 102 is arranged on the outer periphery of the pole connector 2; and further comprising: a limiting notch 103 arranged between the stop protrusions 102, the limiting notch 103 being configured to receive the deviation-correcting member ( Figure 1 , 3 , 4, 7, the dotted line parts), the limiting notch 103 is set from the outer edge of the first surface to the pole connector 2; the group of limiting notches 103 are set in the first direction of the connecting piece covering area a ( Figure 1-4 X direction) on opposite sides.

[0038] The function of the stop frame 1 is to abut between the battery cell and the cover body to reduce the vibration of the battery cell in the shell caused by the battery use environment. The main body 101 of the stop frame 1 abuts against the cover body, and the stop protrusion 102 abuts against the battery cell. The battery cell can be selected as a winding core or a laminated battery cell, and in this embodiment, it is a cylindrical winding core. Correspondingly, the outer contour of the main body 101 of the stop frame 1 is cylindrical, the outer contour of the first surface is circular, and the central area is the center area.

[0039] The function of the pole connector 2 is to connect the pole and the electrode connector. The pole connector 2 and the electrode connector are mostly connected by laser welding. The electrode connector includes but is not limited to the negative electrode connector 4 in this embodiment. The negative electrode connector 4 covers at least part of the pole connector 2, and the laser welding area between the negative electrode connector 4 and the pole connector 2 is included in the connector cover area a.

[0040] The function of the limiting notch 103 is to accommodate the deviation-correcting member of the negative electrode connecting piece 4. The lead-out direction of the pole ear and the negative electrode connecting piece 4 is the length direction; the connecting piece covering area a of the pole connector 2 extends along the radial direction of the second surface, and the first direction is the width direction of the connecting piece covering area a (the same as the width direction of the negative electrode connecting piece), and the deviation-correcting member of the negative electrode connecting piece 4 is used to block the two sides of the negative electrode connecting piece 4 in the width direction.

[0041] The two deviation-correcting members move relative to each other in their respective limiting notches 103, and the interval between the deviation-correcting members gradually decreases until they abut against the two side surfaces opposite to the width direction of the negative electrode connecting piece 4, correcting the position of the negative electrode connecting piece 4 and maintaining the position for laser welding with the pole connecting piece 2, thereby ensuring that the laser welding position is more accurate. After welding is completed, the two deviation-correcting members move away from each other in their respective limiting notches 103 and separate from the negative electrode connecting piece 4.

[0042] exist Figure 1 , 3 4, the two limiting notches 103 opposite to each other in the first direction are a group; then the number of groups of limiting notches 103 of the cover assembly can be selected to be more than two groups, and the positions of the two groups of limiting notches 103 are as follows Figure 7 Indicated by two groups of left and right relative arrows.

[0043] like Figure 1 As shown, the part shown by the dotted line is the electrode connecting piece. When the width of the electrode connecting piece is larger than the first direction dimension of the pole connecting piece 2 directly facing the limiting notch 103, there is no need to set an avoidance notch on the edge of the pole connecting piece 2.

[0044] like Figure 2 , 3 As shown in FIG. 4 , in another preferred embodiment, an avoidance notch 201 is provided at the edge of the pole connector 2, and the avoidance notch 201 is provided correspondingly and continuously with the limiting notch 103. This structure is suitable for a case where the width of the electrode connecting piece is smaller than the first direction dimension of the pole connector 2 at the limiting notch 103.

[0045] In this embodiment, on the basis of setting the avoidance recess 201, the width of the negative electrode connecting sheet 4 can be appropriately set to be smaller, and the laser welding area and the central area of ​​the pole connector 2 are arranged in sequence along the length direction to make the combined structure of the pole connector 2, the negative electrode connecting sheet 4 and the pole ear more compact.

[0046] like Figure 1 , 2 As shown, in another preferred embodiment, the pole connector 2 is provided with a first connecting portion 202 , the first connecting portion 202 is connected to the pole, and the limiting notches 103 are symmetrically arranged on two opposite sides of the first direction of the first connecting portion 202 .

[0047] In this embodiment, the first connection portion 202 is located in the central area of ​​the pole connector 2. In the cover assembly of the cylindrical battery, the negative electrode connector 4 is centrally distributed, that is, the cover is fixed at the central position of the electrode connector, and the cover assembly and the negative electrode connector 4 are welded to form a first assembly. The central connection is conducive to improving the structural stability of the first assembly during high-speed transfer and reducing the deformation effects of wind resistance, inertia, etc. on the pole ear and the electrode connector during high-speed transfer.

[0048] like Figure 1-4 As shown, in another preferred embodiment, a limiting protrusion 104 is provided on the first surface of the main body 101, and the limiting protrusion 104 is spaced apart from the pole connector 2. The limiting protrusion 104 is provided on the side of the second direction of the connecting piece covering area a, and the first direction and the second direction ( Figure 1-4 The limiting protrusion 104 has a connecting piece abutting surface b.

[0049] In this embodiment, the second direction is perpendicular to the first direction. When the cover assembly is assembled to the negative electrode connecting sheet 4, the longitudinal end surface of the negative electrode connecting sheet 4 is pressed against the limiting protrusion 104 to fix the relative position of the cover assembly and the winding core along the winding core axis.

[0050] like Figure 1 , 5 As shown, in another preferred embodiment, a cover plate body 3 is provided on the side of the stop frame 1 away from the pole connector 2, and the cover plate body 3 is connected to the pole connector 2 through the pole.

[0051] like Figure 1-3 As shown, in another preferred embodiment, the outer edge of the pole connector 2 is provided with a first notch 203 for accommodating the bent portion of the electrode connecting piece; the limiting notch 103 and the first notch 203 are arranged in groups on the opposite side edges of the pole connector 2.

[0052] In this embodiment, the first notch 203 is a circular segment with a central angle less than 180°. The first region 401 of the negative electrode connecting sheet 4 covers the first notch 203, and the second region 402 of the negative electrode connecting sheet 4 is directly opposite to the limiting notch 103 along the first direction, and the second region 402 is located at a position away from the pole ear from the first region 401.

[0053] like Figure 2 As shown, in some embodiments, the first direction spacing between the two avoidance recesses 201 is equal to the first direction dimension L1 of the connecting piece covering area a, and the first direction dimension of the connecting piece covering area a is the width of the negative electrode connecting piece; Figure 6 As shown, the first direction distance between the two avoidance recesses 201 is smaller than the first direction dimension L1 of the connection piece covering area a.

[0054] When the first direction spacing between the two avoidance recesses 201 is equal to the first direction dimension L1 of the connecting piece covering area a, the correcting piece abuts against the opposite side of the negative connecting piece 4 in the width direction, and also abuts against the avoidance recess 201; when the first direction spacing between the two avoidance recesses 201 is less than the first direction dimension L1 of the connecting piece covering area a, the correcting piece abuts against the opposite side of the negative connecting piece 4 in the width direction, and there is a gap between it and the concave surface of the avoidance recess 201.

[0055] like Figure 1 As shown, in another preferred embodiment, the limiting protrusion 104 is arranged between the limiting notches 103, and the contact surface between the limiting protrusion 104 and the negative electrode connecting sheet 4 is arranged to be larger, which is beneficial to improving the position accuracy of the cover assembly in the axial direction of the winding core.

[0056] like Figure 5 As shown, the battery of the embodiment includes the above-mentioned cover plate assembly, and also includes a winding core 5 and a shell 6. The pole lug of the winding core 5 is connected to the pole connector 2 through an electrode connecting sheet.

[0057] In some embodiments, the negative electrode connecting piece 4 is a magnetic connecting piece.

[0058] Optional magnetic connection pieces include but are not limited to:

[0059] 1. The electrode connecting sheet is configured as a layered structure, which includes a magnetic attraction layer in addition to the copper layer of the electrode connecting sheet itself, including but not limited to a magnetic attraction metal layer, such as a nickel layer.

[0060] 2. Based on the sheet material of the electrode connecting sheet itself, a mesh-shaped or multi-point-shaped magnetic material layer, such as magnetic metal nickel, is sputtered on the electrode connecting sheet.

[0061] In this embodiment, the function of the magnetic connecting piece is to keep the negative connecting piece 4 adsorbed on the pole connector 2. In the magnetic state, the negative connecting piece 4 and the pole connector 2 are not prone to relative displacement, so as to fix the relative position of the negative connecting piece 4 and the pole connector 2 before and after the correction by the correction piece.

[0062] The assembly process of the cover plate assembly and the winding core 5 includes the following steps:

[0063] S1: the end edge of the negative electrode connecting piece 4 in the longitudinal direction abuts against the limiting protrusion 104 or a gap is formed between the negative electrode connecting piece 4 and the limiting protrusion 104;

[0064] S2: a magnetic attraction member is arranged on the surface of the cover body 3 of the cover assembly so that the magnetic attraction negative electrode connecting piece 4 is adsorbed on the pole connecting piece 2;

[0065] S3: The two correcting members move relative to each other in their respective limiting notches 103, and the interval between the correcting members gradually decreases until they abut against the two side surfaces opposite to the width direction of the negative electrode connecting sheet 4, and the position of the negative electrode connecting sheet 4 is corrected to a predetermined welding position, and the two correcting members move in opposite directions in their respective limiting notches 103 to separate from the negative electrode connecting sheet 4;

[0066] S4: Welding and connecting the pole connector 2 and the negative electrode connector 4;

[0067] S5: Remove the magnetic attraction member on the surface of the cover body 3.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A cover assembly, include: The stop frame comprises a main body and a stop protrusion disposed on a first surface of the main body; A pole connector, fixedly overlapped on a central area of ​​a first surface of the main body, and having a connection sheet covering area on a second surface facing away from the stop frame; The stop protrusion is arranged on the outer periphery of the pole connector; characterized in that it also includes: A limiting notch is provided between the stop protrusions, configured to accommodate a deviation-correcting member of the electrode connecting piece, and is provided from the outer edge of the first surface to the pole connecting member; The group of limiting notches are arranged at two opposite sides of the first direction of the area covered by the connecting piece.

2. The cover assembly according to claim 1, It is characterized in that The edge of the pole connector is provided with an avoidance recess, and the avoidance recess is correspondingly and continuously arranged with the limiting notch.

3. The cover assembly according to claim 1, It is characterized in that The pole connector is provided with a first connecting portion, the first connecting portion is connected to the pole, and the limiting notches are symmetrically arranged on two opposite sides of the first connecting portion in a first direction.

4. The cover assembly according to claim 1, It is characterized in that A limiting protrusion is provided on the first surface of the main body, the limiting protrusion is spaced apart from the pole connector, and the limiting protrusion is provided on the side of the second direction of the connecting piece covering area, the first direction intersects with the second direction; the limiting protrusion has a connecting piece abutting surface.

5. The cover assembly according to claim 1, It is characterized in that A cover plate body is arranged on the side of the stop frame away from the pole connector, and the cover plate body is connected to the pole connector through the pole.

6. The cover assembly according to claim 1, It is characterized in that The outer edge of the pole connector is provided with a first notch for accommodating the bent portion of the electrode connecting piece; The limiting notch and the first notch are respectively arranged on two opposite side edges of the pole connector.

7. The cover assembly according to claim 2, It is characterized in that The first direction distance between the two avoidance recesses is equal to or smaller than the first direction dimension of the covering area of ​​the connecting piece.

8. The cover assembly according to claim 4, It is characterized in that The limiting protrusion is arranged between the two limiting notches.

9. A battery, It is characterized in that The cover plate assembly comprises the cover plate assembly according to any one of claims 1 to 8, further comprising a winding core and a shell, wherein the pole lugs of the winding core are connected to the pole connector via electrode connecting sheets.

10. The battery according to claim 9, It is characterized in that The electrode connecting piece is a magnetic connecting piece.

Images